<form id="participantForm" method="post" action="<?php echo $CFG->wwwroot; ?>/mod/elluminate/user-edit.php">
    <input type="hidden" name="id" value="<?php echo $id;?>" />
    <input type="hidden" name="sesskey" value="<?php echo $sesskey; ?>" />
    <input type="hidden" id="submitvalue" name="submitvalue" value="" />
    <input type="hidden" name="type" value="<?php echo $myWebHelper->userEditType ?>" />
        <table style="margin-left:auto; margin-right:auto;">
            <tr align="center">
                <td colspan="2"><?php echo get_string('sessioncreator','elluminate') . " " . format_string($strcreator->firstname)  . " " . format_string($strcreator->lastname) . " (" . format_string($strcreator->username) . ")";   ?></td>                
            </tr>        
            <tr align="center">
                <td><?php echo $strCurrentUsers; ?></td>
                <td><?php echo $strAvailableUsers; ?></td>
            </tr>
            <tr align="center">
                <td>
                    <select name="currentUsers[]" size="15" class="select" multiple style="min-width: 175px">
<?php
   echo $myWebHelper->getCurrentUserSelectHTML();
?>
                    </select>
                </td>
                <td>
                    <select name="availableUsers[]" size="15" class="select" multiple style="min-width: 175px">
<?php
   echo $myWebHelper->getAvailableUserSelectHTML();
?>
                    </select>
                </td>
            </tr>
            <tr align="center">
                <td><input id="removeSubmit" type="submit" value="<?php echo $strRemoveButton . '-&gt;'; ?>"/></td>
                <td><input id="addSubmit" type="submit" value="<?php echo '&lt;- ' . $strAddButton ?>"/></td>
            </tr>
        </table>
</form>